Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45d6323fe13c9db…

MALICIOUS

PDF

93.3 KB Created: 2021-03-18 15:04:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f123f6afc7e025d618946fb1daff4374 SHA-1: 59e546c8b7d7ce30bc95aa12a5a89e3059cc042e SHA-256: c45d6323fe13c9db4e1bcb5b4169548f5aa593cd22c58b2d56acf5ccafd0fa54
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/award?keyword=airfoils+definition+pdf PDF link annotation
    • https://nulasexojexof.weebly.com/uploads/1/3/4/0/134012614/df9a6f06b73c.pdfIn PDF document text
    • https://cdn.sqhk.co/fojilude/gaP6Mi1/pirates_of_the_caribbean_cast_6.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/00e7ce1f4.pdfIn PDF document text
    • https://cdn.sqhk.co/buruvalufe/hJ0hhhj/zombie_games_zombie_games_online.pdfIn PDF document text
    • https://rafifawu.weebly.com/uploads/1/3/4/0/134042442/9856232.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/hycxO61/h_and_m_kids_sale.pdfIn PDF document text
    • http://womenit.space/online_marathi_converterpig0f.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/revipujaromaxow-xidutewibifesa-bires-rajisukesor.pdfIn PDF document text
    • http://topstop.site/garmin_vivoactive_3_hr_user_manualaq77b.pdfIn PDF document text
    • https://cdn.sqhk.co/tiruxugajo/ibGSLib/talking_dog_drug_commercial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_4d1618ece87442c794234fdf2be95d6c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d14d900-9f9b-4619-aac0-bed3c71f7721/setagigu.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/42744511064.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_46ac6c85977043bbb09d6e9ce50d7ba5.pdf?index=trueIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_e69d452726864d16a98b50c0a4045dba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2aad7c1-fabc-4f5a-8d58-45fddacf0f9c/wordpress_user_login_page_plugins.pdfIn PDF document text
    • https://cdd249b8-77b1-4a94-b024-8995efe4d959.filesusr.com/ugd/d394ff_9affd8012b834ae8b7f8dd294754ff3b.pdf?index=trueIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_37fe73c32fde44bcb51fb4d192ac06a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/summer_hd_baby_monitor_no_signal.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/26232234732.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001177c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177C 4816 bytes
SHA-256: 6e5697a18b534725eacee89dc07d59320203b65fcb8d666f231cf2665e824ad9
font_01_sfnt_off000127ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EC 12572 bytes
SHA-256: 95d789916a35c364693a975b94d90ee82ada258158d7ffbb44af0a8e392e3f51
font_02_sfnt_off00015332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15332 16064 bytes
SHA-256: 0da5b551d84a453f500a6ba8ca1adfd4400b36dae0f103b74fb712e1a4f46a36